The existing change and monitoring shack (241-228H) for Tanks 13 through 16 was sized for routine operations. Several tank closure projects (ongoing and in the future) have caused personnel traffic to increase beyond the capacity of the existing building. During crew changes, the queue wait is exorbitantly long causing inefficient use of manpower. There is insufficient room inside the existing shack for work crews to dress out in anti-contamination clothing. This activity (MT-HTF-2011-00005) will install a change and monitoring shack (new, refurbished, or relocated) that is of sufficient size (30 feet ?12 feet) to handle the increased work load.